According to your requirements, buy a laptop

It’s easy just going into a shop and coming out with a laptop. But it shouldn’t work like that. First, you must match the machine with your prime needs. If document editing, email and browsing is all you need, a basic, entry level laptop (13.3-15 inch) will do. Even a 10-inch netbook may be enough. Handling graphics, images or video regularly? Or heavy on gaming? Get a high-end machine with a graphics processor.
Know your budget
Choose a processor, memory, hard disk, screen-size and weight according to your requirements and then balance them to fit your budget best. A base configuration today should comprise: 2.0-GHz Core 2 Duo processor, 2GB RAM, 160GB HDD, 13.3-inch screen, 3.5 hours battery life, multiple USB 2.0 ports, WiFi, and Bluetooth. No matter what you buy, advancing technology will ensure that it will be outdated in a couple of years.
Google for a review
Computers are unreliable, but humans are even more unreliable. Don’t leave it to the dealer to choose for you. He may have vested interests. And don’t fall for a laptop just because it looks snazzy — unless you only want some “lap candy”! Always physically check out a recommended model — or whatever takes your fancy — then deploy Google to find reviews to ascertain the good, the bad, and the ugly about it before forking out your cash.
Battery life
The attention span of a computer is only as long as its electrical cord. If long battery life doesn’t seem very important to you, remember the prime reason you’re buying a portable computer is to have the convenience of being able to work/play untethered to your desk. And many a time, you will not be near a power source. Hence, a long battery life is very convenient, if not vital. Try and buy a laptop with a 6 or 8 cell battery. Look for something that gives you at least 3.5 to 4 hours of battery life at least. To keep the battery in shipshape, use the laptop on battery at least twice a week, if not more often.
Variations can be huge
Never blindly follow the herd. Or hearsay. Just as car models from the same manufacturer differ in build, quality and performance, laptops and notebooks from one company can vary hugely. Just because your pal’s two-year Toshiba laptop is still a smoothie, doesn’t necessarily mean every Toshiba will be a scorcher.
Extended warranty
Murphy’s law says: if anything can go wrong, it will. This couldn’t be more true for laptops in which any component — from the relatively inexpensive adapter to the very expensive screen — can go bust anytime. It always makes money sense to buy an extended warranty with your laptop. This stretches the warranty of your laptop one to two years beyond the mandatory first year. An extra Rs. 5,000 to 8,000 initially will give you peace of mind and wallet for the next two to three years.